Category Ranking
98%
Total Visits
921
Avg Visit Duration
2 minutes
Citations
20
Article Abstract
Dental enamel is subjected to a lifetime of de- and re-mineralization cycles in the oral environment, the cumulative effects of which cause embrittlement with age. However, the understanding of atomic scale mechanisms of dental enamel aging is still at its infancy, particularly regarding where compositional differences occur in the hydroxyapatite nanocrystals and what underlying mechanisms might be responsible. Here, we use atom probe tomography to compare enamel from a young (22 years old) and a senior (56 years old) adult donor tooth. Findings reveal that the concentration of fluorine is elevated in the shells of senior nanocrystals relative to young, with less significant differences between the cores or intergranular phases. It is proposed that the embrittlement of enamel is driven, at least in part, by the infusion of fluorine into the nanocrystals and that the principal mechanism is de- and re-mineralization cycles that preferentially erode and rebuild the nanocrystals shells.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11659160 | PMC |
| http://dx.doi.org/10.1038/s43246-024-00709-8 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Electrochemical Identification of Facet-Governing Redox Behavior and Catalytic Reactivity of Co(OH) in the Oxygen Evolution Reaction.
ACS Nano
September 2025
State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Traditional electrochemical redox assessments offer insights into material properties for charge storage and catalytic kinetics but often fail to link these to specific surfaces, obscuring the structure-performance relationship. Here, we reveal the facet-dependent electrochemical redox behaviors and their connection to oxygen evolution reaction (OER) catalysis using Co(OH) nanosheets and nanorods as models. By correlating redox charge storage capacity and kinetics with distinct exposed surfaces, we uncover diffusion-controlled redox processes on the basal surface and non-diffusion-controlled behavior on the lateral surface and further utilize the distinct redox charging kinetics to differentiate the two.
View Article and Find Full Text PDFEffects of Gold Nanoparticles on the Antioxidant Power of Gallic Acid: A Computational Investigation Using a Cluster Model.
ACS Omega
September 2025
Molecule and Materials Modeling Laboratory, and Department of Chemistry, Can Tho University, Can Tho 94000 Viet Nam.
Computational approaches within the framework of density functional theory (DFT) are used to probe the effects of gold nanoparticles (AuNPs) on the antioxidant potency of gallic acid (HGA), which is a prototypical polyphenolic acid. Four small gold clusters, Au with = 2, 3, 6, and 11, are employed as simple models to simulate the surface of AuNPs. The antioxidant capacity is evaluated through the ability to donate a hydrogen atom and to transfer an electron, which are characterized by the bond dissociation enthalpy (BDE) and ionization energy (IE) of the antioxidant, respectively.
View Article and Find Full Text PDFConstructing Aggregation-Induced Emission Luminogens With Significantly Improved Performance Through Local Chemical Modification From Thiophene to Thiophene Sulfone.
Luminescence
September 2025
Beijing Key Laboratory of Energy Conversion and Storage Materials, Beijing, China.
A novel aggregation-induced emission (AIE) system with superior performance was successfully developed through local chemical modification from thiophene to thiophene sulfone. This approach, leveraging easily accessible tetraphenylthiophene precursors, dramatically enhances the photophysical properties in a simple oxidation step. Notably, the representative 2,3,4,5-tetraphenylthiophene sulfone (3c) demonstrates remarkable solid-state emission characteristics with a fluorescence quantum yield of 72% and an AIE factor of 240, substantially outperforming its thiophene analog.
View Article and Find Full Text PDFStrong Metal-Support Interactions in Catalytic Oxidation of VOCs: Mechanistic Insights, Support Engineering Strategies, and Emerging Catalyst Design Paradigms.
Environ Sci Technol
September 2025
School of Environmental Science and Engineering, Tianjin University/Tianjin Key Lab of Biomass/Wastes Utilization, Tianjin 300072, P.R. China.
Volatile organic compounds (VOCs) significantly impact air quality as photochemical smog precursors and health hazards. Catalytic oxidation is a leading VOC abatement method but suffers from catalyst deactivation due to metal sintering and competitive adsorption in complex mixtures. Strong metal-support interactions (SMSIs) provide atomic level control of interfacial electronic and geometric structures.
View Article and Find Full Text PDFPropargyl (∙C3H3) and butadienyl (∙i-C4H5) radical-radical reactions well-skipping to vinylcyclopentadienyl radical and toluene: A theoretical and kinetic modeling study.
J Chem Phys
September 2025
MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, Guangdong Provincial Key Laboratory of Laser Life Science, Guangzhou Key Laboratory of Spectral Analysis and Functional Probes, College of Biophotonics, School of Optoelectronic Science and Engineering, South China Normal Un
Propargyl radical (•C3H3) and butadienyl radical (•i-C4H5) are two crucial intermediates in combustion and astrochemistry, particularly in the formation of C7H8 aromatics such as toluene. However, the precise formation mechanisms of the first-ring aromatics through C3 + C4 reactions have remained ambiguous. This study explores the detailed potential energy surface (PES) of C7H8 at the •C3H3 + •i-C4H5 entrance reaction channel, alongside conducting kinetic calculations and modeling.
View Article and Find Full Text PDF